Coal saving spark-catcher



Dec. 5, 1933. E GOTTSCHALK 1,938,016

COAL SAVING SPARK CATCHER Filed June 1l, 1931 Patented Dec. s, 1933"ifNirEofsT-ATES PATENT-pornos f y 1,938,016 A COAL sAvlNG sPAaK-oAToHEnEduard Gottschalk, Magdeburg, Germany, as

vsignor to Paul Weile, Magdeburg, lGermany Application June 11,1931.Serial No. 543,665, and Y inGermany August 251930 Y 1o claims. (ci.133478) Appliances.. for catching `or extinguishing sparks operatingWith propellerswhich are causedA to rotate in the same or oppositedirectionrto one another are known. A novel feature of this 5 invention.is the arrangement of intermediate blades on the Vpropellers which aredisplaced angularly with respect to the main-blades. They are shorter,than the main-blades which extendY toy within a short distance from theinnersuring through the center of the `funnel strike the short vaneswhich cover a Wide area'of the gasoW Without interfering with the lfreepassage of the burnt gases, as is the case when Wire screens, perforatedvaries etc. are usedk Which fare very liable to becomeclogged-.withinavshort time of action, thereby diminishing theV area 'offlow.V

- -The intermediate varies are also responsible for changing the numberof revolutions of the propellers according to their'angle andv lead.They accelerate'the rotation if the angle of the intermediate` vanesconforms toy that of themaiin blades, and if inversely inclined theyretard the rotating speed. Hence the velocity of the propellersy oanberegulated without affecting the ratio of the openings, that is, thequotient of the area covered by the propellers at restV toy the areasection of the funnel. u Y

For larger diameters of funnel it may be ad-` Visable also to providethe upper n propeller with intermediate blades. Y Y' y When the gasesare discharged in sudden periodicalblows, the blades haveto be madeflexible so as. to guard the. supports against rupture. This isaccomplished by a steel-spring-attachment located between the hub of thepropellerand the bolt-head of the propeller shaft.

Where the quantitiesof gases passing 'throughk the chimney arechanginggreatly the distance 4o between the propellers must be eitherincreased or decreased as the Volume of the `flue gasleavf ing thefunnel increases or decreases. This is accomplished by a correspondingadjustment of the springs arranged on the upper propeller. If the springis relieved by turning the adjusting nut back, the blade defiectsautomatically and While in operation, thus increasing the spacebe- 4tween the two propellers.v It willjbe noticed thatA thisadjustment'occurs without changing the lo- 501 cation of the support andlubricating system.

A new feature lies also in the fact that the propellers can be broughtto perfect alignment with the axis of the funnel. With this arrangementlinings in the funnel which entail a de- 551 crease of the crosssectional area can be avoided.

faceof the chimney. ,The hot coal particles pasa' .The ladjusting screwsextending through the sides of 4the smoke stack, by .being made with acentralV bore, also provide for the intake of lubricant' and the oilseal at the bearing. A kcollar-nut secures the screw to the funnel, atlthe same time 6o 'protecting' v'the threads against beinglburnt, fur'-thermore providinga smoke seal. g Another new feature is that theintermediate 'varies are so arranged that they vcan easily beremovedfrom the "main-blades v'This arrange- 65 ment not only lfacilitates themanufacture ofl those'parts but 'also makes it possible toeliminate theintermediate vanes when it is necessary, o r to Yinterchange the upperandA the lower vanos-'so carried'by. vertical shafts 14 rotatablymounted in ball bearings 15. The propellers 1 and2 may bekeyedto theshafts 14, but have a limited axialmovement ontheir shafts under therestraint 'of springs 4, the upperr endsv of which abut against heads 6of the shafts' 14. Fixed-to l the hub of each of the propellers 1` and2-is a n i smaller propeller 3, which has a denite angular position unthrespect tothe larger propeller, the blades being located between'theblades of the larger propeller as shown in Fig. II. The smallerpropellers increase the obstruction to sparks at :the center of thesmokefstack Wherethe a'otion. of the larger propellers is least becauseof the loW- y95.

er velocity of the blades near the axis of rota-H tion. The smallerpropellers also iniluence the speed of the larger propellers inaccordance with thek Vlength and angle of vinclination of their"blades.y i

. In the modification shown in Fig. III the smaller propeller`12 islocated above the large propeller 11 andv is axially slidable on thevshaft 14, while the `larger propeller 11 is fixed lto the shaft anddoes not participate in the axial shifting movement.

`In this modification the spring 4 is restrained by an adjusting nut 7by which the tension of the spring can be varied to modify the slidingof the small propeller on the shaft. Y vIn each form of the inventionshown, the ball bearing 15 is mounted at the center of a threearmedspider 16, the arms of which are hollow. At the outer ends the arms 16are provided with screw threaded sockets 17 into which are threadedadjusting bolts 8 extending through holes in the wall of the smokestack. Threaded on the adjusting bolts 8 are collar nuts 10, which fitover the holes in the smoke stack and tighten down.

on packing washers 13. The adjusting bolts 8 are screwed tightly intothe sockets 17 and the three collar nuts 10 and washers 13 are tightenedagainst the wall of the smoke stack in proper mutual relation to centerthe propeller in the smoke stack. The bolts 8 have a central borecommunicating with a tube 18 leading through the hollow arm of thespider to the bearing 15. The outer ends of bolts 8 receive the ends oflubricating pipes 19 through which a lubricant can be forced forlubricating the bearings 15.

What I claim is:

l.V The combination with a locomotive smokestack, of spark arrestingmeans comprising two propellers mounted in said stack so as to beindependently rotatable about the axis of the stack and having bladesinclined to said axis so as to have a torque imparted to them by thefluid current in the stack; at least one of said propellers havingconnected therewith, in a deiinite angular relation, a propeller ofsmaller diameter, whose blades are intermediate the blades of the largerpropeller connected therewith.

2. The combination with a locomotive smokestack, of spark arrestingmeans comprising two units, each composed of a propeller having adiameter nearly as great as the inner smokestack diameter and asupporting spider on which Y said propeller is rotatably mounted; thespace between said; units being clear to form a mobile air cushion, theblades of said propellers being reversely inclined with respect to theaxis of said stack to causethemto rotate in opposite directions; atleast one of said propellers having connected therewith, in a iixedangular relation, a

propeller of smaller diameter, the blades or" staCk, of spark arrestingmeans comprising two propellers mounted in said stack so as to berotatable about the axis of the stack, the blades of said propellersbeing inversely inclined with respect to the axis of the stack to causethem to be rotated in opposite directions by the fluid current in thestack; each propeller having connected therewith in a fixed angularrelation a propeller vof smaller diameter, the blades of said smallerpropellers lying between the blades ci'. the largerpropellers; saidsmaller propellers having blades of such relative length and inclinationas to cause -said larger propellers to rotate at a predeterminedrelative speed.

5. A device as described in claim 1, in which said propeller of smallerdiameter is detachably mounted. on the larger fan with which it isassociated.

6. The combination with a locomotive smokestack, of spark arrestingmeans comprising a support in said stack and a propeller yieldably androtatably mounted on said support and adapted to be rotated by the uidcurrent in said stack and to be moved axially in said stack in responseto changes in pressure.

7. A device as described in claim 6, in combination with regulatingmeans for adjusting the tension of the; yieldable mounting of saidpropeller.

8. rIhe combination with a locomotive smokestack of spark arrestingmeans comprising a propeller in said stack mounted for rotation aboutthe axis or said stack and having a diameter nearly as great as theinner diameter of said stack, and a propeller of smaller diametermounted above said large propeller in iixed.

angular relation thereto and with its blades between the blades of saidlarge propeller, said small propeller being mounted to shift axiallywith respect to said large propeller, and yieldable means opposingupward movement of sai small propeller. 9. The combination with alocomotive smokestack of a three armed spider mounted transversely insaid stack by means of adjusting screws at the ends of the armsA of saidspider passing through holes in the wall of they stack, nuts mounted onsaid screws and adapted to cover said holes in the wall of the stack andto center said spider in the. stack, and a propeller rotatably U mountedupon said spider.

16. The combination with a locomotive smoke-` stack of a three armedspider mounted transversely in saidl stack by means of adjusting screws,whereby the spider can be centered in said stack; a bearing at thecenter of said spider; a shaft rotatably mounted in said bearing; apropeller on said shaft, one of the arms of said spider and theadjusting screw supporting the same having a lubricating ducttherethrough leading to said bearing, and means for feeding a lubricantto said duct.

`. EDUARD GOTTSCHALK.

IDO

